Estimation of Groundwater Recharge under various land ... - RMZ

188 Purandara B. K., Venkatesh B. & V. K. ChoubeySaturated hydraulic conductivitywas measured at 9 locations in thestudy area by using disc permeameter(locations are shown in Figure1).The average saturated hydraulicconductivity values for the surfacewas measured by using disc permeameterand lower layer by usingGuelph permeameter.4. van Genuchten Parameters: Thecollected soil samples from thestudy area were analysed in thelaboratory by pressure plate apparatusfor soil moisture retentioncharacteristics. The averaged van-Genuchten parameters for the twosoil layers were obtained by nonlinearregression analysis (Table 1).5. Vegetation: Forested watershed,minimum xylem potential = –15000cm, exponential root growth withdepth and sigmoid with time wereassumed for the study.Table 1. Measured saturated hydraulic conductivity and van Genuchten Parameters forthe Two Soil LayersZonesCoastalPlateauUp-GhatLand use typeNatural ForestDegradedForestAfforestedNatural forestDegradedForestAfforestedNatural ForestDegradedForestAfforestedSoil LayersDepth (cm)SamplesizeLog-mean Ksat(mm/h)Van-GenuchtenParameterSurface 10 93.92 0.0192 1.6161120–150 10 44.74 0.0105 1.6270Surface 12 6.73 0.0201 1.7008120–150 12 0.20 0.0298 1.5353Surface 10 88.20 0.0792 1.2586120–150 10 88.20 0.8118 1.2446Surface 15 11.88 0.0044 1.9400120 – 150 15 0.21 0.0110 1.8151Surface 12 6.21 0.0119 1.6320120–150 12 0.40 0.0123 1.6296Surface 15 6.01 0.0050 1.8698120–150 15 0.60 0.0051 1.7644Surface 20 179.64 0.0253 1.4570120–150 20 1.66 0.0104 1.4514Surface 20 2.78 0.0214 1.3563120–150 20 2.78 0.0201 1.5861Surface 20 90.00 0.0125 1.6925120 –150 20 43.2 0.003 1.7701anRMZ-M&G 2010, 57